1. The gradual accumulation of sediment, soil, or other material deposited by flowing water, especially along riverbanks or in flood plains.
Usage: technical; geology/geography
2. Land formed by the gradual deposition of alluvial material; newly formed land created by water action.
Usage: legal; technical

Examples

• The river's alluvion created fertile soil ideal for farming.
• Over centuries, alluvion built up along the delta, expanding the coastline.
• Geologists studied the layers of alluvion to understand the region's flood history.
• The property owner claimed the alluvion that formed on his land belonged to him.
• Alluvion deposits are rich in nutrients and support diverse plant life.